1020 Flashcards
Test
To read system pressure the service valves are placed in the _____ position
Cracked
The ____ rejects heat in the refrigeration cycle
Condenser
The ____ absorbs heat in the refrigeration cycle
Evaporator
The condenser performs three functions when operating properly. Name these functions in the order in which they occur.
Desuperheating
Condense
Subcooling
The purpose of the TEV is to maintain a nearly constant ____
with varying toads on the
evaporator.
Superheat
The TEV sensing bulb is connected to the
of the evaporator coil.
Outlet
An increase in superheat causes the pressure on top of the TEV’s diaphragm to
Increase
A pump down procedure is started when the
valve is front seated
Liquid line
Which type of system is considered a critical charge?
Cap tube
The receiver is located in the
Liquid line
To accurately measure a deep vacuum you would use
Vacuum gauge
The most accurate method of charging a self-contained system (refrigerator, window unit) is?
Weigh-in
Vapor refrigerant is added to an operating system through the
Suction line
The term evacuation refers to?
Using vacuum pump
A fan cycle control on the condenser motor is used to
Lower head pressure in hot weather
A refrigerator system holds 8 pounds and 12 ounces of refrigerant cylinder weighs 34 pounds and 5 ounces. How much should the cylinder weigh after the system is properly charged?
25 pounds and 9 ounces
A R134A system is operating with a low side pressure of 24 psig and a high side pressure of
140 psig. The suction line temperature in 35F and liquid line temperature of 95F. What is the superheat?
9F Find sat temp of low side pressure
When liquid charging the refrigeration system should be ____
and liquid refrigerant
should be charged in to the ____
ON; liquid line
What would happen to the head pressure if the condenser fan motor did not operate?
Increase
What happens to compressor amperage draw with an increase in head pressure?
Increase
What happens to the superheat with a dirty evaporator?
Increase
There are two places in a system that divide the low and high side. One is the valves in the compressor and the second one is the
Expansion device
